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Structure and Properties of β-Polypropylene Reinforced by Polypropylene Fiber and Polyamide Fiber

Chinese Journal of Polymer Science 2014年第4期32卷 509-518页

作者： Qi liu hui-hui li 闫寿科 State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Matrix/fiber composites of,β-form isotactic polypropylene （iPP） matrix and α-iPP or PA6 fibers were prepared by laminating technique under different preparation temperatures. The mechanical properties and interracial morphologies of these composites were studied by tensile test, optical microscopy and scanning electron microscopy, respectively. The experimental results show that the tensile yield load and tensile modulus of β-iPP/PA6 matrix/fiber systems increased significantly at the expense of elongation at break. These mechanical properties show essentially no dependence on the sample preparation temperature. On the other hand, the mechanical properties of iPP matrix/fiber single polymer composites depend strongly on the sample preparation temperature. At low sample preparation temperature, e.g., 172 ℃, the solid cr-iPP fiber induces tr-iPP crystallization, leading to the formation of a-iPP transcrystalline layer around the fiber. This results in a remarkable increment of the tensile yield load and tensile modulus. The elongation at break is also much better than that of the iPP/PA6 matrix/fiber system. It reflects a better interracial adhesion of the single polymer composite compared with the iPP/PA6 composite. At higher sample preparation temperature, e.g., 174 ℃ or 176 ℃, the partial surface melting of the oriented fiber allows interdiffusion of iPP molecular chains in the molten fiber and matrix melt. The penetration of matrix chains into the molten iPP fiber results in some iPP molecular chains being included partially in the recrystallized fiber and the induced β-transcrystalline layers. This kind of configuration leads to an improvement of interfacial adhesion between the fiber and matrix, which causes a simultaneous increase of the tensile yield load, tensile modulus and elongation at break of β-iPP.

关键词： Polypropylene Composite Mechanical property Interfacial morphology.

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A reviving templating method for multiple nanostructures

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Science China Materials 2017年第5期60卷 461-462页

作者： hui-hui li Shu-Hong Yu Division of Nanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the Microscale Department of Chemistry University ofScience and Technology of China Hefei 230026 China

Binary materials,comprised by two dissimilar components in one matrix,already exist in nature from the subatomic to the universal scale with different kinds of forms(e.g.,nuclei and electrons,matter and antimatter)[1]... 详细信息

关键词：英语阅读理解材料科学

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Investigation of formation of dimeric G-quadruplex of HIV-1 integrase inhibitor by nuclear magnetic resonance

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Chinese Chemical Letters 2008年第9期19卷 1108-1110页

作者： hui hui li Gu Yuan Beifing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Department of Chemical Biology College of Chemistry and Molecular Engineering Peking University Beifing 100871 China

In this research, an unusually dimeric G-quadruplex of d（GGGTGGGTGGGTGGGT）（SI）, the potent nanomolar HIV-1 integrase inhibitor, was detected by nuclear magnetic resonance （NMR）. This result has been confirmed b... 详细信息

关键词： G-quadruplex HIV-1 integrase inhibitor Nuclear magnetic resonance

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Morphology Evolution,Conductive and Viscoelastic Behaviors of Chemically Reduced Graphene Oxide Filled Poly(methyl methacrylate)/Poly(styrene-co-acrylonitrile) Nanocomposites during Annealing

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Chinese Journal of Polymer Science 2015年第8期33卷 1162-1175页

作者： Chao-ying lin 左敏 hui-hui li Ting liu Qiang Zheng MOE Key Laboratory of Macromolecule Synthesis and Functionalization Ministry of EducationDepartment of Polymer Science and EngineeringZhejiang University

The effect of chemically reduced graphene oxide （CRGO） on the phase separation behavior of poly（methyl methacrylate）/poly（styrene-co-acrylonitrile）（PMMA/SAN） blends and the simultaneous response of rheological and conductive behavior of PMMA/SAN/CRGO nanocomposites upon annealing above the phase-separation temperatures were investigated. The introduction of CRGO causes the decrease of binodal temperature and the increase of spinodal temperature for PMMA/SAN blends and then enlarges their metastable regime. During annealing, the well-dispersed CRGO in the homogeneous blend matrix tends to be selectively located in the SAN-rich phase with the evolution of phase separation and then the CRGO further agglomerates effectively in the SAN-rich phase to form the conductive pathway. Thermal-induced dynamic percolation is observed for both the resistivity p and dynamic storage modulus G＇ as a function of annealing time. The resistivity variation is ascribed to the agglomeration of CRGO in the SAN-rich phase, while the modulus evolution is attributed to the combined contribution of phase separation for blend matrix and the agglomeration of CRGO in the SAN-rich phase.

关键词： Phase separation Chemically reduced graphene oxide PMMA/SAN blend Electrical conduction Dynamicmodulus.

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Structure of Friction-transferred Highly Oriented Poly(3-hexylthiophene) Thin Films

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Chinese Journal of Polymer Science 2016年第4期34卷 513-522页

作者： li-guo Chai Hai-xin Zhou Xiao-li Sun hui-hui li 闫寿科 Xiao-qiu Yang State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Basic Research Service MOSTBeijing 100862China

Oriented thin films of P3HT were obtained by a friction-transfer technique. The morphology and structure of the film were studied by means of optical microscopy, atomic force microscopy and transmission electron microscopy. Optical microscopy observation indicates that large size well-ordered P3HT thin films can be produced by a friction-transfer technique. Highly ordered lamellae were observed in P3HT friction-transferred films by electron microscopy. Electron diffraction results confirm the existence of high orientation with the a- and c-axes of P3HT crystals aligned in the film plane while the c-axis parallel to the friction-transfer direction. The atomic force microscopy observation of the as-prepared P3HT thin film shows, however, a featureless top surface morphology, indicating the structure inhomogeneity of the obtained film. To get highly oriented P3HT thin films with homogenous structure, high temperature annealing, solvent vapor annealing and self-seeding recrystallization of the friction-transferred film were performed. It is confirmed that solvent vapor annealing and self-seeding recrystallization methods are efficient in improving the surface morphology and structure of the friction- transferred P3HT thin film. Highly oriented P3HT films with unique structure can be obtained through friction-transfer with subsequent solvent vapor annealing and self-seeding recrystallization.

关键词： Poly(3-hexylthiophene) Friction-transfer Thin film Orientation.

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Enhanced αγ′ Transition of Poly(vinylidene fluoride) by Step Crystallization and Subsequent Annealing

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Chinese Journal of Polymer Science 2018年第5期36卷 598-603页

作者： Yi-Ran Zheng Jie Zhang Xiao-li Sun hui-hui li Zhong-Jie Ren Shou-Ke Yan State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

Poly（vinylidene fluoride）（PVDF） exhibits pronounced polymorphs. Its γ phase is attractive due to the electroactive properties. The γ-PVDF is however difficult to obtain under normal crystallization condition. In a previous work, we reported a simple melt-recrystallization approach for producing γ-phase rich PVDF thin films through selective melting and subsequent recrystallization. We reported here another approach for promoting the αγ′ phase transition to prepare γ-phase rich PVDF thin films. To this end, a stepwise crystallization and subsequent annealing process was used. The idea is based on a quick generation of a large amount of α-PVDF crystals with some of their γ-PVDF counterparts at suitable crystallization temperature and then annealing at a temperature above the crystallization temperature for enhancing the molecular chain mobility to overcome the energy barrier of phase transition. It was found that crystallizing the PVDF melt first at 152 °C for 4 h, then quenching to room temperature and finally annealing the sample at 160 °C for 100 h was the most efficient to produce γ-PVDF rich films. This is related to the melting and recrystallization of the α-PVDF crystals produced during quenching in the annealing process at 160 °C, which favors the formation of γ-PVDF crystals for triggering the αγ′ phase transition.

关键词： Poly(vinylidene fluoride) Step crystallization Annealing Phase transition

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Topological Aspects of Triplet Superconductors

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Communications in Theoretical Physics 2007年第5期47卷 944-948页

作者： REN Ji-Rong XU Dong-hui ZHANG Xin-hui li Ran Institute of Theoretical Physics Lanzhou University Lanzhou 730000 China

In this paper, using the Φ-mapping theory, it is shown that two kinds of topological defects, i.e., the vortex lines and the monopoles exist in the helical configuration of magnetic field in triplet superconductors. And the inner topological structure of these defects is studied. Because the knot solitons in the triplet superconductors are characterized by the Hopf invariant, we also establish a relationship between the Hopf invariant and the linking number of knots family, and reveal the inner topological structure of the Hopf invariant.

关键词： triplet superconductor topological defects Hopf invariant

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Investigation of the interaction between HIV-1 DNA and cyclic peptides by electrospray ionization mass spectrometry

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Chinese Chemical Letters 2009年第3期20卷 330-333页

作者： Yi Quan liu hui hui li Yun Hua Ye Gu Yua Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Department of Chemical Biology College of Chemistry and Molecular Engineering Peking University Beifing 100871 China School of Chemistry and Environmental Science Nanjing Normal University Nanjing 210097 China

The interaction between HIV-1 DNA and five cyclic peptides （CP1-CP5） was investigated using electrospray ionization mass spectrometry （ESI-MS）. It revealed that CP1 [c（Ala-Tyr-Leu-Ala-Gly）] and CP4 [c（Pro-D-Tyr... 详细信息

关键词： HIV-1 DNA Cyclic peptide ESI-MS

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On-demand synthesis of high-quality,blue-light-active ZnSe colloidal quantum wires

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National Science Review 2022年第10期9卷 137-146页

作者： Yi li Chong Zhang Jie Tian liang Wu Guo-Qiang liu hui-hui li Yu-Zhuo Zhang Zhen-Chao Shao Zhen He Shu-Hong Yu Department of Chemistry Institute of Biomimetic Materials and Chemistry Anhui Engineering Laboratory of Biomimetic Materials Division of Nanomaterials and Chemistry Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Engineering and Materials Science Experiment Center University of Science and Technology of China

Beyond the state-of-the-art Cd-containing quantum wires(QWs),heavy-metal-free semiconductor QWs,such as ZnSe,are of great interest for next-generation environmental-benign ***,simultaneous,on-demand manipulation of their radial and axial sizes—that allows strong quantum confinement in the blue-light region—has so far been *** we present a two-step catalyzed growth strategy that enables independent,high-precision and wide-range controls over the diameter and length of ZnSe *** find that a new epitaxial orientation between the cubic-phase Ag2Se solid catalyst and wurtzite ZnSe QWs kinetically favors the formation of defect-free ultrathin *** to their high uniformity,the resulting blue-light-active,phase-pure ZnSe QWs exhibit well-defined excitonic absorption with the 1Se-1Shtransition linewidth as narrow as sub-13 *** the transient absorption spectroscopy,we further show that surface electron traps in these ZnSe QWs can be eliminated by thiol passivation,which results in long-lived charge carriers and high-efficiency solar-to-hydrogen conversion.

关键词： zinc selenide colloidal synthesis quantum wires heavy-metal-free solar conversion

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Understanding the stability and reactivity of ultrathin tellurium nanowires in solution： An emerging platform for chemical transformation and material design

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Nano Research 2015年第4期8卷 1081-1097页

作者： liang Xu Hai-Wei liang hui-hui li Kai Wang Yuan Yang Lu-Ting Song Xu Wang Shu-Hong Yu Division of Nanomaterials and Chemistry Hefei National Laboratory for Physical Sciences at Microscale Collaborative InnovationCenter of Suzhou Nano Science and Technology Department of Chemistry University of Science and Technology of China Hefei230026 China

The stability and reactivity of nanomaterials are of crucial importance for their application, but the long-term effects of stability and reactivity of nanomaterials under practical conditions are still not well understood. In this study, we first established a comprehensive strategy to investigate the stability of a highly reactive nanomaterial from the viewpoint of reaction kinetics with ultrathin tellurium nanowires （TeNWs） as a model material in aqueous solution through an accelerated oxidation process. This allowed us to propose a new approach for the design and synthesis of other unique one-dimensional nanostructures by a chemical transformation process using the intermediate nanostructures ＂captured＂ during the dynamic oxidation process under different conditions. In essence, the oxidation of ultrathin TeNWs is a gas-solid reaction which involves liquid, gas and solid phases. It has been demonstrated that the oxidation process of ultrathin TeNWs in aqueous solution can be divided into three stages, namely oxygen limiting, ultrathin TeNWs limiting and mass transfer resistance limiting stages. The apparent oxidation kinetics for ultrathin TeNWs is approximately in accord with a first order reaction kinetics model and has an apparent activation energy as low as TeNWs are thermodynamically unstable 13.53 ***^-1, indicating that ultrathin However, the unstable nature of ultrathin TeNWs is actually an advantage since it can act as an excellent platform to help us synthesize and design one-dimensional functional nanomaterials--with special structures and distinctive properties--which are difficult to obtain by a direct synthesis method.

关键词： stability reactivity oxidation reaction kinetics chemical transformation storage ultrathin nanowires

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